Chemistry: You are to make 100.0ml of a 0.50 m acetate buffer (pka = 4.72) at ph 5.00 using 0.50 m stocks of acetic acid and sodium acetate. 6. using henderson-hasselbalch and the information given, calculate the value of [a-]/[ha].

You are to make 100.0ml of a 0.50 m acetate buffer

Ответ:

maddy1276

12.03.2022

$[\text{A}^{-}] / [\text{HA}] \approx 0.525$

Explanation:

The Henderson-Hasselbalch equation estimates the value of $[\text{A}^{-}] / [\text{HA}]$ of a buffer given its and the acid dissociation constant of weak acid $\text{HA}$ :

$pH \approx pK_{a} + \text{log}_{10} ([\text{A}^{-}] / [\text{HA}])$

Rearranging:

$[\text{A}^{-}] / [\text{HA}] \approx 10^{-pH} / 10^{-pK_a}$

The question states that

and

Thus

$[\text{A}^{-}] / [\text{HA}] \approx 10^{-5.00} / 10^{-4.72} = 0.525$

Reference:

Gurinder Khaira and Alexander Kot (UCD), "Henderson-Hasselbalch Approximation," Chemistry Libretext

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Ответ:

rakanmadi87

11.01.2020

Chemistry

ElementSymbolNumber of Atoms

CobaltumCo1

OxygeniumO2

HydrogeniumH2

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You are to make 100.0ml of a 0.50 m acetate buffer (pka = 4.72) at ph 5.00 using 0.50 m stocks of acetic acid and sodium acetate. 6. using henderson-hasselbalch and the information given, calculate the value of [a-]/[ha].

Ответ:

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